package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("common")
@Slf4j
public class CommonController {
	@Value("${reggie.path}")
	private String basePath;
	/**
	 * 文件上传
	 * @param file
	 * @return
	 */
	@PostMapping("upload")
	public R<String> upload(MultipartFile file){
		//file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除

		//原始文件名
		String originalFilename = file.getOriginalFilename();
		String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

		//使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
		String fileName = UUID.randomUUID() + suffix;

		//创建一个目录对象
		File dir = new File(basePath);
		//判断当前目录是否存在
		if(!dir.exists()){
			//目录不存在，需要创建
			dir.mkdirs();
		}

		try {
			//将临时文件转存到指定位置
			System.out.println(basePath+fileName);
			file.transferTo(new File(basePath+fileName));
		} catch (IOException e) {
			e.printStackTrace();
		}
		return R.success(fileName);
	}

	/**
	 * 文件下载
	 * @param name
	 * @param response
	 */
	@GetMapping("download")
	public void download(String name , HttpServletResponse response){
		try {
			FileInputStream fis = new FileInputStream(new File(basePath+name));
			ServletOutputStream os = response.getOutputStream();
			IOUtils.copy(fis,os);
			fis.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}    